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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 0 |
Due after one year through five years | 12,110 |
Due after five years through ten years | 15,729 |
Due after ten years | 7,627 |
Available-for-sale debt securities, amortized cost basis | 238,790 | $ 239,945
Estimated Fair Value |  |
Due within one year | 0 |
Due after one year through five years | 12,150 |
Due after five years through ten years | 15,909 |
Due after ten years | 7,567 |
Available-for-sale debt securities, estimated fair value | 236,979 | 232,975
Amortized Cost |  |
Due within one year | 990 |
Due after one year through five years | 28,477 |
Due after five years through ten years | 34,557 |
Due after ten years | 76,688 |
Amortized Cost | 160,980 | 163,164
Estimated Fair Value |  |
Due within one year | 996 |
Due after one year through five years | 29,093 |
Due after five years through ten years | 35,627 |
Due after ten years | 77,267 |
Held-to-maturity securities, estimated fair value | 163,110 | 162,800
Mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 95,322 |
Available-for-sale debt securities, amortized cost basis | 95,322 | 93,083
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 93,746 |
Available-for-sale debt securities, estimated fair value | 93,746 | 89,459
Amortized Cost |  |
Amortized Cost | 16,521 | 17,163
Held-to-maturity securities, without single maturity date | 16,521 |
Estimated Fair Value |  |
Held-to-maturity securities, estimated fair value | 16,301 | 16,717
Held-to-maturity securities, without single maturity date | 16,301 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities without single maturity date | 108,002 |
Available-for-sale debt securities, amortized cost basis | 108,002 | 111,341
Estimated Fair Value |  |
Available-for-sale securities without single maturity date | 107,607 |
Available-for-sale debt securities, estimated fair value | 107,607 | 108,969
Amortized Cost |  |
Amortized Cost | 3,747 | 4,059
Held-to-maturity securities, without single maturity date | 3,747 |
Estimated Fair Value |  |
Held-to-maturity securities, estimated fair value | 3,826 | $ 4,079
Held-to-maturity securities, without single maturity date | $ 3,826 |

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